Electric switch



Nov. 10, 1925 A. VOLLAND ELECTRIC SWITCH Filed Jan. 26, 1925 I'I I I FPatented Nov. 10, 1925.

UNITED STATES ALBERT. venue or rummeeqr, ess cmn. QF' ZONE-HALE T WILL M9 mesa-e P PWQTPN LEQ P 3 1.13.3

Application fi'l ed January 26;, 1923. Serial No. 6151163.

To all whom it may concern Be it known that I, ALBERT V LLAn D, acitizen of the United States, residing at Burlington, in the county ofCofiey and State of Kansas, have invented a new and useful ElectricSwitch, of which the followin is a specification.

his invention relates to electric switches and more particularly toautomatic alarm switches.

The object of the invention is to so construct a switch ofthis-character that it may be used in connection with a closure where asliding or jam contact is available to normally hold the switch in openposition, the

switch automatically closing on the opening of the closure and connectedto' operate a signal when so closed.

Another object is to provide a simple and efiicient switch of thischaracter which may be installed so as to be practically concealed toadapt an alarm to be sounded without giving notice to the personsounding it.

lVith the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed may be made within thescope of what is claimed without departing from the spirit of theinvention.

In the accompanying drawings Figure 1 represents a vertical sectionthrough a window frame with this improved switch shown applied and inside elevation.

Fig. 2 is a longitudinal section through the switch. I

Fig. 3 is a front elevation thereof.

Fig. 4 is a transverse section taken on the line 44 of Fig. 2, and

Fig. 5 is a diagrammatic view showing the wiring for the switch.

In the embodiment illustrated, the switch 1 constituting this inventionis shown mounted in a window frame F and is operable by the slidingmovement of the sash S, the switch being held in open position when thesash is lowered as shown in Fig. 1, and which will automatically closeon the opening of the sash as shown in Fig. 2.

The switch 1 includes a hollow casing 2 which may be of any desiredcross sectional configuration, being here shown in the form of acylinder open at both ends. This cylinder is provided at one. end with alaterally extend-iing apertured attaching flange 3 for connection with aface. plate 10, said plate being equipped with apertures to. re-

ceive fasteningibolts 12 and shown provided designed to .be connected, acurrent conducting wire \V.

The plunger head 15 is carried by a rod 16. mounted to reciprocate inthe casing, 2, said rod extendingtlu'ough a guide disk or washer 22fixedlymounted in the inner end of the casing- 2. This rod extends thrug said disk andicarriesat its outer end an insulating disk 17 which isencased within a metal shell 18 having a wire attaching lug or car 19 atits outer end and an inturned flange 20 at its inner end. WVhen theflange 20 abuts the outer end of the casing 2, the circuit is closed andthe current flows through the switch from the source B and sounds thealarm A, which is preferably in the form of a bell.

The insulating disk 17 is shown connected with the end of rod 16 by apin 21 which extends transversely of the disk and is embedded thereinand through the rod 16, as is shown clearly in Figs. 2 and 4.

A coiled spring is mounted on the rod 16 within the casing 2 and bearsat one end against the disk 22 and at its other end against a stop 24which is here shown in the form of a pin extending transversely throughthe rod. This spring 23 exerts its tension to normally project theplunger head 15 and to move the rod 16 outwardly into position to bringthe shell 18 into engagement with the casing 2 and thereby close theswitch.

The plunger head 15 which extends through a slot 25 in the face plate 10is rounded or curved on its outer face as shown clearly in Figs. 1 and 2to adapt the plunger to be moved inwardly by a sliding closure or by apush exerted thereon so that it may be used either in connection withlunged doors or sliding windows or the like. This switch s located 1n ac1rcu1t having a knife switch 26 so that when not desired for use, theswitch 1 may be thrown out of operation. 7 V

In the use of this invention, the switch 1 having been mounted in anopening in a window frame F with the face plate 10 arranged fiush withthe outer face of said frame, the plunger head 15 will project into thepathof the sash S so that when said sash is lowered into closedposition, the plunger will be forced inwardly, thereby moving the shell.18 away from the casing 52 and breaking the contact. This is the normalposition of the parts when the window is closed. When the window isopened suliiciently to move the sash S out of engagement with theplunger head 15, the

spring23 will project said head and move the shell 18 into contact withthe casing 2 and thereby close the switch and sound the alarm; I

lVhile this device is shown in connection with a window, obviously itmay be used in many other places, being applicable to cash boxes,vaults, counterdrawers, doors or any form of window where a sliding orjam contact is available,

Various changes in the form, shape, proportion and other minor detailsof construction may be made without departing from the principle orsacrificing any of the advantages of the claimed invention.

ends with an instruck annular rib near one I end on its inner face andat its other end with a-laterally extending apertured attaching flangefor connection witha support, said casing having an apertured tonguestruck out of one side wall thereof designed to receive a currentconducting wire, an insulating disk mounted in said casing and heldengaged therein by said rib, a rod mounted to reciprocate in theinsulating disk of said casing, and having a headat one end projectingbeyond one end of the casing, an insulating disk carried by the otherend of said rod, a metal shell encasing said disk and having a wireattaching lug and an inturned flange at its inner end adapted to abutthe outer end of the casing to close the circuit, a coiled springmounted on the rod within the casing and adapted to normally project thehead carried by the rod and to close the circuit, said head beingdesigned to engage a cooperating, member for holding the circuit open.

In testimony that I claim the foregoing as my own, I have hereto affixedmy sig-' nature.

